<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>学生信息管理</title>
  <link rel="stylesheet" href="css/index.css" />
</head>

<body>
  <h1>新增学员</h1>
  <form class="info" autocomplete="off">
    姓名：<input type="text" class="uname" name="uname" />
    年龄：<input type="text" class="age" name="age" />
    性别:
    <select name="gender" class="gender">
      <option value="男">男</option>
      <option value="女">女</option>
    </select>
    薪资：<input type="text" class="salary" name="salary" />
    就业城市：<select name="city" class="city">
      <option value="北京">北京</option>
      <option value="上海">上海</option>
      <option value="广州">广州</option>
      <option value="深圳">深圳</option>
      <option value="曹县">曹县</option>
    </select>
    <button class="add">录入</button>
  </form>

  <h1>就业榜</h1>
  <table>
    <thead>
      <tr>
        <th>学号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>薪资</th>
        <th>就业城市</th>
        <th>操作</th>
      </tr>
    </thead>
    <tbody>
      <!-- 
        <tr>
          <td>1001</td>
          <td>欧阳霸天</td>
          <td>19</td>
          <td>男</td>
          <td>15000</td>
          <td>上海</td>
          <td>
            <a href="javascript:">删除</a>
          </td>
        </tr> 
        -->
    </tbody>
  </table>
  <script>
    // 1.录入
    // 1.1绑定事件
    document.querySelector('.add').addEventListener('click',function(e){
      // *阻止默认行为
      e.preventDefault()
      // 1.2收集用户输入
      const uname = document.querySelector('.uname').value
      const age = document.querySelector('.age').value
      const gender = document.querySelector('.gender').value
      const salary = document.querySelector('.salary').value
      const city = document.querySelector('.city').value

      // *生成id
      const trs = document.querySelectorAll('tbody>tr')
      let id = 0
        // 判断trs数量
      if(trs.length > 0){
        // 此时已有tr
        id = parseInt(trs[trs.length-1].children[0].innerHTML) + 1
        
      }else{
        // 此时没有tr
        id = 1
      }
      

      // 1.3 创建节点
      const tr = document.createElement('tr')
      tr.innerHTML = `
        <td>${id}</td>
        <td>${uname}</td>
        <td>${age}</td>
        <td>${gender}</td>
        <td>${salary}</td>
        <td>${city}</td>
        <td>
          <a href="javascript:">删除</a>
        </td>
      `

      // 1.4 追加
      document.querySelector('tbody').appendChild(tr)



    })


    // 2.删除节点
    document.querySelector('tbody').addEventListener('click',function(e){
      if(e.target.tagName === 'A'){
        // 2.1 锁定目标并删除
        e.target.parentNode.parentNode.remove()
      }
    })
  </script>

</body>

</html>